Couper, A. D. (1972). The geography of sea transport. Hutchin University Library.
Lua i Stíl Chicago (17ú heag.)Couper, A. D. The Geography of Sea Transport. London: Hutchin University Library, 1972.
Lua MLA (9ú heag.)Couper, A. D. The Geography of Sea Transport. Hutchin University Library, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.